Image reading device

ABSTRACT

An image reading device having a conveying unit for conveying an irradiated member that has a hologram area in a conveying direction; a first light source for applying light to an irradiated part in the hologram area; and a second light source separated from the first light source along the conveying direction and applying light to an irradiated part in the hologram area when the hologram area is conveyed by a prescribed distance. An irradiation angle at which the irradiated part is irradiated with the light of the first light source is made to be different from an irradiation angle at which the irradiated part is irradiated with the light of the second light source when the hologram part is conveyed by the prescribed distance. Lights reflected by the hologram area are respectively received to detect an electric signal of the hologram area of the irradiated member.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of and claims the benefitof priority from U.S. application Ser. No. 11/467,399, filed Aug. 25,2006, which claims the benefit of priority from Japanese PatentApplication No. 2006-070519, filed Mar. 15, 2006; the entire contents ofeach of the above are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an image reading device for reading ahologram part of an irradiated member such as a bank note.

2. Description of the Related Art

As such kind of reading device, for instance, a label identifying devicedisclosed in JP-A-2000-293105 has been hitherto known. InJP-A-2000-293105, a beam light is applied to a light receiving surfaceof a reflecting member of a light identifying label from one lightsource and the light receiving surface of the reflecting member convertsthe beam light to two reflected lights. Then, a first light component issupplied to a first sensor and a second light component is supplied to asecond sensor. Further, in a recognizing device for sheets described inJP-A-2006-39996, a structure is disclosed that lights outputted from alighting device and penetrating the sheets are guided to a lightreceiving element through a lens array.

SUMMARY OF THE INVENTION

However, in the label identifying device disclosed in JP-A-2000-293105,the light from the light source is applied to the light receivingsurface of the reflecting member of the label and the two kinds of lightcomponents reflected by the light receiving surface are detected by thetwo kinds of sensors whose installation angles are different from eachother. Since a lens for focusing the lights does not exist, a problemarises that a read position of an image to be identified or a focusingposition is not determined, so that whether or not the label is true canbe macroscopically identified, but the label is insufficientlyidentified in view of a minute pixel level. Further, in the recognizingdevice disclosed in JP-A-2006-39996, the configurations of the sheetscan be recognized, however, parts of the sheets that the lights do notpenetrate cannot be undesirably read in principle.

It is an object of the present invention to provide a new image readingdevice in which lights reflected in an area where an optical changepattern such as a hologram is pressed and fixed to or printed on anirradiated member are received to read a hologram area and discriminatea truth or falseness thereof for the irradiated member.

It is another object of the present invention to provide an imagereading device capable of more highly accurately discriminating a truthor a falseness in which white light sources are applied to an irradiatedpart in a hologram part (area) provided along the conveying path of anirradiated member at respectively different angles to detect thedifference of spectrum in reflected lights generated in the hologramarea.

According to a first aspect of the invention, there is provided an imagereading device including: a conveying unit for conveying an irradiatedmember that has a hologram area in a conveying direction; a first lightsource for applying light to an irradiated part in the hologram area;and a second light source separated from the first light source alongthe conveying direction and applying light to an irradiated part in thehologram area when the hologram area is conveyed by a prescribeddistance. An irradiation angle at which the irradiated part isirradiated with the light of the first light source is made to bedifferent from an irradiation angle at which the irradiated part isirradiated with the light of the second light source when the hologrampart is conveyed by the prescribed distance, and lights reflected by thehologram area are respectively received to detect an electric signal ofthe hologram area of the irradiated member.

According to a second aspect of the invention, there is provided theimage reading device according to the first aspect wherein the firstlight source has a light guide part for guiding the light to theirradiated part and is provided at a remoter position from theirradiated part than the second light source.

According to a third aspect of the invention, there is provided an imagereading device including: one and the other light sources; a light guidepart for guiding the light of the one light source to an irradiated partin a hologram area of an irradiated member; a lens array for convergingthe lights of the one and the other light sources reflected by theirradiated part of the hologram area; and first and second image sensorshaving sensors for receiving the lights converged by the lens array. Thefirst and second image sensors are separated from each other by aprescribed distance in a conveying direction, and when the reading ofthe light by the one light source is carried out in the first imagesensor, the reading of the light by the other light source is carriedout in the second image sensor to detect an electric signal of thehologram area of the irradiated member.

According to a fourth aspect of the invention, there is provided theimage reading device according to the third aspect, wherein the firstand second image sensors are formed integrally.

According to a fifth aspect of the invention, there is provided an imagereading device including: a conveying unit for conveying an irradiatedmember that has a hologram area in a conveying direction; a first lightsource provided on a first substrate; a light guide part for guidinglight so as to irradiate the hologram area of the irradiated member withthe light of the first light source; a first lens array for convergingthe lights reflected by the hologram area; a first sensor provided on asecond substrate to receive the lights converged by the first lensarray; a second lens array opposed to the first lens array; a firstlight shield member provided between the first lens array and the secondlens array and disposed on the second substrate; a second light sourceprovided on the first light shield member to apply light to anirradiated part of the hologram area conveyed by the conveying unit atan irradiation angle different from an irradiation angle at which thehologram area is irradiated with the light of the first light source; asecond sensor provided on the second substrate for receiving the lightsof the second light source reflected by the hologram area and convergedby the second lens array; and a checking unit for checking whether ahologram in the hologram area is true or false in accordance with outputsignals of the first and second sensors.

According to a sixth aspect of the invention, there is provided theimage reading device according to the fifth aspect, wherein the firstlight source is a plasma light source and the second light source is anLED light source.

According to a seventh aspect of the invention, there is provided theimage reading device according to the fifth aspect, wherein lightapplying directions to the hologram area by the first and second lightsources are respectively considered to be components of the conveyingdirection of the irradiated member.

According to an eighth aspect of the invention, there is provided theimage reading device according to the sixth aspect, wherein in thesecond light source, one angular part of a prism shaped reflectingmember is cut out to form an output part of light.

According to a ninth aspect of the invention, there is provided theimage reading device according to the seventh aspect, wherein a secondlight shield member is provided at a part opposite to the output part ofthe light of the second light source.

According to a tenth aspect of the invention, there is provided theimage reading device according to the fifth aspect, wherein the secondlight source is supplied electric power from the second substratethrough the first light shield member.

According to a eleventh aspect of the invention, there is provided theimage reading device according to the first aspect, wherein the firstlight source is a white colored light source and the second light sourceis a quasi-white colored light source for emitting lights of a pluralityof wavelengths.

According to a twelfth aspect of the invention, there is provided theimage reading device according to the third aspect, wherein the firstand second image sensors are arranged both in the front side and theback side of the irradiated member and the relative positions thereofare shifted in the conveying direction of the irradiated member.

According to a thirteenth aspect of the invention, there is provided animage reading device including: a conveying unit for conveying anirradiated member that has a hologram area in a conveying direction; afirst light source for applying light to an irradiated part in thehologram area; a second light source separated from the first lightsource along the conveying direction, applying light to an irradiatedpart in the hologram area when the hologram area is conveyed by aprescribed distance, and provided so as to apply light to the irradiatedpart when the hologram area is conveyed by the prescribed distance at anirradiation angle different from an irradiation angle at which theirradiated part is irradiated with the light of the first light source;first and second lens arrays for respectively converging the lights ofthe first and second light sources reflected by the irradiated parts inthe hologram area; first and second sensors for receiving the lightsrespectively converged by the first and second lens arrays tophotoelectrically convert the lights; and a checking unit for comparingoutput signals of the first and second sensors with each other to checkwhether a hologram in the hologram area of the irradiated member is trueor false.

According to a fourteenth aspect of the invention, there is provided animage reading device including: a conveying unit for conveying anirradiated member that has a hologram area in a conveying direction; afirst light source for applying light to an irradiated part in thehologram area; a second light source separated from the first lightsource along the conveying direction, applying light to an irradiatedpart in the hologram area when the hologram area is conveyed by aprescribed distance, and provided so as to apply light to the irradiatedpart when the hologram area is conveyed by the prescribed distance at anirradiation angle different from an irradiation angle at which theirradiated part is irradiated with the light of the first light source;first and second lens arrays for respectively converging the lights ofthe first and second light sources reflected by the irradiated parts inthe hologram area; first and second sensors for receiving the lightsrespectively converged by the first and second lens arrays tophotoelectrically convert the lights; a difference detecting unit fordetecting a difference value of output signals of the first and secondsensors; a storing unit for storing a true hologram distribution map inthe hologram area of the irradiated member; and a checking unit forcomparing the detecting signal of the difference detecting unit withtrue hologram distribution map data taken from the storing unit to checkwhether the hologram in the hologram area of the irradiated member istrue or false.

According to a fifteenth aspect of the invention, there is provided theimage reading device according to fourteenth aspect, wherein thechecking unit temporarily stores a difference value of the outputsignals of the first and second sensors in a RAM.

According to a sixteenth aspect of the invention, there is provided theimage reading device including: a conveying unit for conveying anirradiated member that has a hologram area in a conveying direction; ahologram detecting unit for detecting the passage of the hologram areaof the irradiated member to output a detecting signal; a first lightsource for applying light to an irradiated part in the hologram area ofthe irradiated member; a second light source separated from the firstlight source along the conveying direction of the irradiated member andapplying light to an irradiated part in the hologram area when theirradiated member is conveyed by a prescribed distance at an irradiationangle different from a prescribed irradiation angle in the first lightsource; a lighting control unit for respectively controlling the firstand second light sources to be turned on when the detecting signal ofthe hologram detecting unit is received; and a sensor IC forrespectively receiving the lights by the first and second light sourcesreflected from the hologram area to detect an electric signal of ahologram in the hologram area of the irradiated member.

According to a seventeenth aspect of the invention, there is providedthe image reading device according to the sixteenth aspect, wherein thelighting control unit controls the first light source in a pre-stage inthe conveying direction of the irradiated member to be turned on, andthen, controls the second light source in a post-stage to be turned onafter a prescribed time elapses.

According to a eighteenth aspect of the invention, there is provided theimage reading device according to the sixteenth aspect, wherein thelighting control unit controls the first or the second light source tobe turned on only for a time of the passage of the hologram area of theirradiated member in the conveying direction.

According to a nineteenth aspect of the invention, there is provided theimage reading device according to the sixteenth aspect, wherein thelighting control unit detects that the hologram area of the irradiatedmember passes the hologram detecting unit in a time period where thelevel of the detecting signal from the hologram detecting unit is nothigher than a prescribed level.

According to a twentieth aspect of the invention, there is provided anote reading method including: applying light to the hologram area of anote at a prescribed irradiation angle; receiving a reflected light fromthe hologram area and converting the light to an electric signal:applying light to the hologram area at an irradiation angle differentfrom the prescribed irradiation angle when the note is conveyed by aprescribed distance to receive the reflected light and convert the lightto an electric signal and checking whether a hologram in the hologramarea of the note is true or false on the basis of these electricsignals.

According to a twenty-first aspect of the invention, there is provided anote reading method including: applying light to a note having ahologram area at a prescribed irradiation angle; receiving a reflectedlight to convert the light to an electric signal; applying light to thenote conveyed by a prescribed distance at an irradiation angle differentfrom the prescribed irradiation angle to receive the reflected light andconvert the light to an electric signal and detecting the hologram areaof the note to check its truth or falseness on the basis of theseelectric signals.

According to above configuration, since the irradiated parts areprovided along the conveying path of the irradiated member, arerespectively irradiated at different angles and the reflected lightsthereof are respectively photoelectrically converted for each pixel bythe sensors respectively provided correspondingly to the reflectedlights to obtain outputs. Thus, the obtained outputs are collated withprescribed hologram collating data. Accordingly, even when the imageinformation of the hologram area of the irradiated member is finelyformed pattern, it can be accurately discriminated whether the hologramis true or false.

According to the above configuration, since the irradiated member isirradiated with the lights including a plurality of spectrums and thereflected lights from the irradiated member are received, an outputcorresponding to the color of the hologram can be obtained as imageinformation. Further, after the reflected lights are allowed to passthrough a color filter provided in the sensor, a photoelectricallyconverted output is obtained. Thus, the light of a strong spectrum isfiltered, so that the hologram emitting weak lights can be effectivelychecked.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional structural view of an image reading deviceaccording to a first embodiment of the present invention.

FIG. 2 is an entire sectional structural view of the image readingdevice according to the first embodiment of the present invention.

FIG. 3 is a plan view of a transmitting member of the image readingdevice according to the first embodiment of the present invention.

FIG. 4 is a side view of the image reading device according to the firstembodiment of the present invention.

FIG. 5 is a plan view of the image reading device according to the firstembodiment of the present invention.

FIG. 6 is a circuit diagram of the image reading device according to thefirst embodiment of the present invention.

FIG. 7 is a flowchart of the image reading device according to the firstembodiment of the present invention.

FIG. 8 is a light source control timing chart of the image readingdevice according to the first embodiment of the present invention.

FIG. 9 is a light source control timing chart of the image readingdevice according to the first embodiment of the present invention.

FIG. 10 is an image outputting timing chart of the image reading deviceaccording to the first embodiment of the present invention.

FIG. 11 is a diagram for explaining an angle of irradiation of a lightsource of the image reading device according to the first embodiment ofthe present invention.

FIG. 12 is a diagram for explaining a kind of a light source and aspectral sensitivity of a sensor of the image reading device accordingto the first embodiment of the present invention.

FIGS. 13A and 13B are plan views of the sensor of the image readingdevice according to the first embodiment of the present invention. FIG.13A shows a monochromatic reading sensor and FIG. 13B shows a colorreading sensor.

FIGS. 14A and 14B are diagrams for explaining a relation between theinserting direction of a note and a hologram of the image reading deviceaccording to the first embodiment of the present invention.

FIG. 15 is a signal processing circuit diagram of outputs of aphoto-sensor of the image reading device according to the firstembodiment of the present invention.

FIG. 16 is a logic diagram of the outputs of the photo-sensor of theimage reading device according to the first embodiment of the presentinvention.

FIG. 17 is a flowchart of a series of operations of the image readingdevice according to the first embodiment of the present invention.

FIG. 18 is a hologram diagram of the image reading device according tothe first embodiment of the present invention.

FIGS. 19A to 19C are floating island type hologram distribution diagramof the image reading device according to the first embodiment of thepresent invention. FIG. 19A shows entire data stored in a RAM, FIG. 19Bshows reduced hologram data and FIG. 19C shows collating data.

FIG. 20 is a block diagram for explaining a collating method of theimage reading device according to the first embodiment of the presentinvention.

FIG. 21 is a collating wave form diagram of the image reading deviceaccording to the first embodiment of the present invention.

FIG. 22 is a diagram for explaining outputs of the sensor dividedrespectively for spectrums in the image reading device according to thefirst embodiment of the present invention.

FIG. 23 is a sectional structural view of an image reading deviceaccording to a second embodiment of the present invention.

FIG. 24 is a sectional structural view of an image reading deviceaccording to a third embodiment of the present invention.

FIG. 25 is a plan view of a transmitting member of the image readingdevice according to the third embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION First Embodiment

(Structure)

Now, a first embodiment of the present invention will be described belowby referring to FIG. 1. FIG. 1 is a sectional structural view of animage reading device according to the first embodiment. In FIG. 1,reference numeral 1 designates an irradiated member such as a note,valuable securities or a check, and including an area that lightrelatively hardly penetrates such as a thermal compression bonded partin which a hologram process (holography) is applied to a base materialpreferably having transmitting characteristics, a printed part, a sealbonded part and a part whose color changes depending on an angle ofview.

2 designates a conveying roller (a conveying unit) for conveying theobject 1 (note) to be irradiated with light. 2 a designates a conveyingroller of a sheet feed side, 2 b designates a relay conveying roller and2 c is a conveying roller of a sheet discharge side. 3 designates anirradiated part provided in a conveying path of the note 1. 3 adesignates a first irradiated part and 3 b designates a secondirradiated part. 4 designates a white colored light source (a firstlight source) using a plasma excitation such as a fluorescent lamp, acold cathode tube or the like. 4 a applies light to the irradiated part3 a and 4 b applies light to the irradiated part 3 b. 5 designates areflecting plate for efficiently applying the light generated in thewhite colored light source 4 to the irradiated part 3. 6 designates aquasi-white colored light source (a second light source) composed of anLED array on which a plurality of light emitting sources such as RGB ora rod shaped light source. 6 a applies light to the irradiated part 3 aand 6 b applies light to the irradiated part 3 b. 7 designates a lightoutput part of the quasi-white colored light source 6. 8 designates awhite colored cover for preventing the leakage of the light of thequasi-white colored light source 6 and serving as a reflecting plate. 9designates a lens array (a rod lens array) for converging the reflectedlights of the light applied to the note 1. 9 a converges the reflectedlights of the note 1 from the irradiated part 3 a and 9 b converges thereflected lights of the note 1 from the irradiated part 3 b.

10 designates a sensor (a light receiving part) composed by linearlyarranging a plurality of semiconductor chips that receive the lightconverged by the lens array 9 and perform photoelectric conversion andincluding a sensor IC in which photoelectric conversion parts(photoelectric conversion circuits) respectively for pixels and drivingcircuits thereof are incorporated. 10 a receives the lights from thelens array 9 a and 10 b receives the lights from the lens array 9 b. 11designates a sensor substrate on which the sensor 10 is arranged. 12designates a signal processing IC (ASIC) for A/D converting an analogsignal photoelectrically converted in the sensor 10, carrying out asignal process for each pixel and calculating and processing imageinformation from the note 1. 13 designates a board formed with a printedcircuit board on which electronic parts are mounted. 14 designateselectronic parts such as a condenser and mounted on the board 13. 15designates a relay connector for transmitting and receiving a signal orpower between the sensor substrate 11 and the board 13. 16 designates anexternal connector supported on the back side of the board 13 forsupplying electric power to a system signal (SCLK), a start signal (SI),a clock signal (CLK) and an input signal of a power source or a lightsource and additionally serves to input and output a control signal andoutput an image signal (SIG) to an external part.

17 designates a transmitting member composed of a plastic material thatis provided along the conveying path. 18 designates an internal casingfor accommodating and supporting the lens array 9 and the sensorsubstrate 11. 19 designates an external casing for accommodating andsupporting the white colored light source 4, the quasi-white coloredlight source 6, the board 13, the transmitting member 17 and theinternal casing 18. 20 designates a light guide path (a light guidepart) provided in the external casing 19 for setting an incident angleof the light applied to the note 1 from the white colored light source 4to a narrow angle. 21 designates a reflection type sensor structure(refer it to as a CIS) in which components excluding the conveyingroller 2 are accommodated. 21 a designates a first CIS for applying thelight of the white colored light source 4 a to the irradiated part 3 aat a narrow angle. 21 b designates a second CIS for applying the lightof the quasi-white colored light source 6 b to the light irradiated part3 b at a wide angle. In the drawing, the same reference numeralsdesignate the same or equivalent parts.

In a reading device mounted on a sheet discriminating machine (a sheetdiscriminator) used in the field of a banking terminal device, a desiredimage may not be possibly read due to the difference between front andback images of the note 1 that is arbitrarily inserted and set.Accordingly, in the first embodiment, as shown in FIG. 2, a case will bedescribed in which the image information of both surfaces of the note 1is read at the same time to discriminate a truth or falseness.

FIG. 2 is a sectional structural view of the image reading device inwhich the CIS 21 of the same structures are arranged in both the sidesof the conveying path of the note 1. A CIS 21 a and a CIS 21 b arearranged on one surface of the conveying path of the note 1. On theother hand, a CIS 21 c and a CIS 21 d are vertically inverted from theCIS 21 a and the CIS 21 b and arranged on the other surface.Accordingly, in a main scanning direction (a read width direction)intersecting at right angles to the conveying direction of the note 1,the scanning directions of the CIS 21 a and the CIS 21 b are the sameand the CIS 21 a and the CIS 21 b are scanned from a left end to a rightend. The scanning directions of the CIS 21 c and the CIS 21 d are thesame, however, the CIS 21 c and the CIS 21 d are scanned from a rightend to a left end. Further, an irradiated part 3 a and an irradiatedpart 3 c, and an irradiated part 3 b and an irradiated part 3 d arespaced by a prescribed distance between them in the conveying path. Inthe drawing, the same reference numerals as those of FIG. 1 show thesame or equivalent parts.

Now, the area of the irradiated part 3 will be described below withreference to FIG. 3. FIG. 3 is a plan view of the transmitting member 17mounted on the CIS 21. 17 w designates a groove (an opening part) of thetransmitting member 17 provided in the converging area of the lens array9. This opening part 17 w is formed as a cavity with a width of 5 mmfrom one end to the other end in the main scanning direction withrespect to the conveying direction of the note 1. In the transmittingmember 17, a de-lustering and black coloring process are applied to theplastic material, lights applied to other parts than the opening part 17w are absorbed and lights radiated from the opening part 17 w areapplied to the note 1 as effective lights.

FIG. 4 is a side view of the image reading device with the conveyingunit removed that is viewed from the main scanning direction. 22designates a holder for fixing the CIS 21 a and the CIS 21 c. 23designates a screw for attaching the CSI 21 and the holder 22. 24 is asystem receiving base for fixing the CIS 21 to a system main body (areading system) of the image reading device. 25 designates a screw forattaching the holder 22 and the system receiving base 24.

FIG. 5 is a plan structural view of the image reading device accordingto the first embodiment including the conveying unit. 30 designates adetecting unit (refer it simply to as a “photo-sensor”, hereinafter.)composed of a separate photo-sensor including a light emitting elementand a light receiving elements and extending from one end to the otherend of the note 1 in the main scanning direction for reading. Thephoto-sensor 30 is provided with a connector. The photo-sensor 30 ispositioned and fixed to the system receiving base (not shown in thedrawing) through a stay 31. The photo-sensor 30 is spaced from theirradiated part 3 a by a prescribed distance (for instance, L=50 mm) inthe direction opposite to the conveying direction of the note 1 so thatthe note 1 passes between the light emitting element and the lightreceiving element of the photo-sensor 30.

Then, in the photo-sensor 30, light outputted from the light emittingelement is reflected on a reflecting part such as a hologram part of thenote 1 and does not reach the light receiving element so that the levelof the light receiving element is substantially zero. As for a lighttransmitting part of the note 1, the light penetrates the lighttransmitting part to reach the light receiving part, so that the levelof the light receiving element shows a variation level. When there is nonote 1, the level of the light emitting element shows a saturationvalue. Accordingly, in conveying the note 1, the photo-sensor 30receives the light by the light receiving element in a level not higherthan the saturation value until the note 1 completely passes. Further,while the note 1 passes the hologram area, the output of the lightreceiving element becomes zero.

32 designates a cassette for accommodating the note 1 that includes acassette 32 a of a sheet feed side and a cassette 32 b of a sheetdischarge side. 33 designates a note base for mounting the cassette 32that includes a note base 33 a of the sheet feed side and a note base 33b of the sheet discharge side. 34 designates a conveying rollerincluding a take-out roller 34 a of the sheet feed side and a take-inroller 34 b of the sheet discharge side. The conveying rollers 34 a and34 b convey the note 1 synchronously with the conveying rollers 2 a, 2 band 2 c by a driving operation of a motor (not illustrated) inaccordance with a prescribed conveying signal.

Therefore, in FIG. 5, the note 1 mounted on the upper part of thecassette 32 a of the sheet feed side is sequentially conveyed to theirradiated parts 3 a and 3 c of the reading areas of the CIS 21 a andCIS 21 c by the conveying rollers 34 a and 2 a. In the conveying path ofthe note 1, the photo-sensor 30 for detecting the edge of the note 1,the light transmitting part and the hologram area has five infrared raysensors provided at equal intervals in the main scanning direction ofreading. When the hologram area of the note 1 is formed from one end tothe other end in the main scanning direction of reading as shown in FIG.5, the photo-sensor 30 may be formed with one infrared ray sensor.

Then, the note 1 passing the reading area is conveyed to the irradiatedparts 3 b and 3 d of the reading areas of the CIS 21 b and CIS 21 d bythe conveying roller 2 b. Finally, the note 1 is accommodated in thecassette 32 b by the conveying roller 2 c and the conveying roller 34 b.Here, the conveying rollers 2 and 34 are respectively synchronously andaccurately driven so that the note 1 is conveyed at a conveying speedof, for instance, 250 mm/sec. In FIG. 5, the same reference numerals asthose of FIGS. 1, 2 and 4 designate the same or equivalent parts.

(Control for Turning on and Turning Off Light Source)

FIG. 6 is a circuit diagram of the image reading device according to thefirst embodiment. In FIG. 6, 40 designates a light source drivingcircuit that turns on and turns off the white colored light source 4 andthe quasi-white colored light source 6, drives the photo-sensor 30 andtransmits output levels from the five photo-sensors 30 to the signalprocessing IC (ASIC) 12. 41 designates a control part (CPU) forcontrolling a series of operations of the light source driving circuit40 or the like.

Initially, a timing signal for firstly detecting the edge part of thenote 1 is inputted to the CPU 41 of the ASIC 12 by the photo-sensor 30.At this time, since the conveying speed of the note 1 is fixed, after atime corresponding to the prescribed distance L between the photo-sensor30 and the irradiated part 3 a elapses, the note 1 comes to theirradiated part 3 a. Accordingly, the light source driving circuit 40 iscontrolled to be driven at that timing to turn on the white coloredlight source 4 a of the CIS 21 a. Similarly, the white colored lightsource 4 c of the CIS 21 c for reading the opposite surface of the note1 is also turned on. Otherwise, the white colored light sources 4 a and4 c may be turned on at the same time by the timing signal for firstlydetecting the edge part of the note 1.

Then, while the note 1 passes the photo-sensor 30, the output of thephoto-sensor 30 is not higher than a saturation level thereof andvaries. The change of the level is determined depending on thetransmittance of light of the note 1. However, in the hologram area(part) of the note 1, a metal pattern process or a thermal compressionbonding process are performed in addition to the thickness of the note1, the level falls substantially to zero.

Then, an opposite edge of the note 1 is detected to complete a processof the photo-sensor 30 for the one sheet of the note 1. During thistime, the output level of each photo-sensor 30 is sampled at intervalsof 5 ms and the size of the note 1 and rough size information of thehologram area are transmitted to the light source driving circuit 40.

Further, when the opposite side edge of the note 1 is detected, sincethe conveying speed of the note 1 is fixed, immediately after theopposite side edge of the note 1 passes the irradiated part 3 a with thelapse of a fixed time, the light source driving circuit 40 is controlledto be driven to turn off the white colored light source 4 a of the CIS21 a. The white colored light source 4 c of the CIS 21 c for reading theopposite surface of the note 1 is also turned off in the same manner.

(Operation of Entire Part of Block Structure)

In FIG. 6, 42 designates an amplifier for amplifying a photoelectricallyconverted analog image signal (SO). 43 designates an A/D(analog/digital) converter of a resolution of 256 digits (8 bits) forconverting the analog signal (SO) to a digital signal. 44 designates acomparison circuit for comparing digital outputs of the SO. 45designates a collating circuit for collating reference data (collatingdata) of a hologram with actually measured data.

Firstly, in accordance with a signal of the reading system (SCLK)transmitted from the reading system, when a start signal (SI) set to areading speed of 0.5 ms/line synchronous with a clock signal (CLK) ofthe CIS 21 is inputted to the sensor 10, the analog signals (SO)photoelectrically converted in the light receiving part (sensor) 10 aresequentially outputted at that timing. SO is amplified by the amplifier42, and then, analog/digital (A/D) converted by the A/D converter 43 andinputted to the comparison circuit 44 and the collating circuit 45.

Now, the comparison and the input of the comparison circuit 44 will bedescribed below. In the first embodiment, the CIS 21 a is separated fromthe CIS 21 b and the CIS 21 a and the CIS 21 b individually have thesignal processing ICs 12. Accordingly, one input of the comparisoncircuit 44 of the CIS 21 a is directly outputted from the A/D converter43 of the CIS 21 a and the other input of the comparison circuit 44 isoutputted from the A/D converter 43 of the CIS 21 b. Further, one inputof the comparison circuit 44 of the CIS 21 b is directly outputted fromthe A/D converter 43 of the CIS 21 b and the other input of thecomparison circuit 44 is outputted from the A/D converter 43 of the CIS21 a. That is, the CIS 21 a and the CIS 21 b have a relation ofinterpolation.

The light source driving circuit 40 to the photo-sensor 30 is performedby the CIS 21 a and the output of the photo-sensor 30 is transmittedcommonly to the CIS 21 a and the CIS 21 b. For comparison, the A/Dconverted digital data of the CIS 21 a that is read by the white coloredlight source 4 a is stored in a RAM 1 and the A/D converted digital dataof the CIS 21 b that is read by the quasi-white colored light source 6 bis stored in a RAM 2.

Subsequently, after the photo-sensor 30 detects the edge of the oppositeside of the note 1, when the CIS 21 b completely reads the note 1, asubtraction process between the data of the RAM 1 and the data of theRAM 2 is carried out to store difference data in one RAM (for instance,RAM 1). Further, a subtraction process is carried out to store only datalarger than a prescribed value in the other RAM (for instance, RAM 2)and an address and the number of data are reduced to obtain an actuallymeasured hologram distribution map. The subtraction processes are notcarried out at the same time, because a peculiar bit is corrected duringthe second subtraction process.

In the second subtraction process of the prescribed value, the data thatis not continuously generated relative to the data in the main scanningdirection and the conveying direction during forming the map is erasedas peculiar data and determined to be zero data. That is, the data isconsidered to be located outside the hologram area. Further, thepeculiar data having a lower numeric value in the continuously generateddata is left as data that is not related to the hologram in the hologramarea. That is, the data is determined to be the hologram area.

As another means, when there are many peculiar data during forming thehologram distribution map, the hologram distribution map may be thinnedto reduce a high resolution map to a ¼ resolution map.

Now, the collating circuit 45 will be described below. The collatingcircuit 45 is a circuit for collating, for instance, the hologramdistribution map stored in the RAM 2 with the reference data (refer italso to as a true hologram distribution map) stored in a RAM 3 as a partof the digital data obtained by previously reading the hologram area ofthe note 1 by the white colored light source 4 and the quasi-whitecolored light source 6.

In the data of the RAM 3, a part of the data in the hologram areas ofvarious kinds of notes including the inserting directions of the notesis distributed and stored in designated address areas. In thephoto-sensor 30, since the size of the note can be extracted and theapproximate size of the hologram area can be recognized, the address ofthe corresponding data of the RAM 3 is selected to collate with thehologram distribution map so that a collating process time can beshortened. In a collating process, since the number of the addresses ofthe hologram distribution map is set to be larger than the number of theaddresses in the data of the RAM 3 and to have its capacity larger thanthe data in the address, the data of the RAM 3 is transferred andrelatively shifted by a one dimensional interactive register to collatethe data with the hologram distribution map for each address.

FIG. 7 shows a series of operations to the collating process in aflowchart. In FIG. 7, STEP 1 (S1) to STEP 3 (S3) is related to theoperations of the photo-sensor 30. STEP 4 (S4) is related to the readingoperation of the CIS 21 a and STEP 5 (S5) is related to the readingoperation of the CIS 21 b. STEP 6 (S6) to STEP 9 (S9) is related to thecomparison and processes thereof. STEP 10 (S10) to STEP 12 (S12) isrelated the collating processes.

The CIS 21 c and the CIS 21 d disposed on the other conveying surface ofthe note 1 are independently driven, though they commonly use thephoto-sensor 30, and carry out the same comparison and collatingoperations as those of the CIS 21 a and the CIS 21 b.

(Operation Timing)

FIG. 8 is a timing chart showing a change of a relation of an outputsignal (FO) of the photo-sensor 30 and a lighting signal of a whitecolored light source 4 c mounted on the CIS 21 c opposed to the whitecolored light source 4 a mounted on the CIS 21 a through the note 1relative to a time base. It is assumed that the note 1 is conveyed at250 mm/sec.

In a part that the note 1 is not present in the photo-sensor 30, sincethe output signal (FO) of the photo-sensor 30 is located at a high level(a saturation level), the light sources 4 a and 4 c are not respectivelyturned on (ON). However, when the edge of the note 1 comes to thephoto-sensor 30, the level of the output signal (FO) of the photo-sensor30 is lowered. At this time, when the output signal (FO) of thephoto-sensor 30 is located within a range of a prescribed level, thatis, when the level of the output signal is lower than Vth1, the whitecolored light source 4 a is turned on and the white colored light source4 c having a different irradiated part is turned on with a little timedelay.

Further, when the opposite edge of the note 1 comes to the photo-sensor30, since the output signal (FO) of the photo-sensor 30 returns to thesaturation level, the white colored light source 4 a is turned off witha time delay in accordance with the distance (L) between thephoto-sensor 30 and the irradiated part 3 a. Further, the white coloredlight source 4 c is correspondingly turned off. Further, in the hologramarea, since the transmittance of the light of the note 1 is low, theoutput signal (FO) of the photo-sensor 30 becomes substantially zero.

FIG. 9 shows respectively turned on and turned off periods of the lightsources of the CIS 21 in conveying the note. In the CIS 21 a and the CIS21 b, the white colored light source 4 a of the CIS 21 a is tuned on,and then, turned off. Then, after a prescribed time, the quasi-whitecolored light source 6 b of the CIS 21 b is turned on, and then, turnedoff. Similarly, in the CIS 21 c and the CIS 21 d, the white coloredlight 4 c of the CIS 21 c is turned on, and then, turned off. Then,after a prescribed time, the quasi-white colored light source 6 d of theCIS 21 d is turned on, and then, turned off. When the light sources 4and 6 are turned on, the start signal (SI) is driven to the continuouslighting section of the clock signal (CLK) to read an image. The systemclock signal (SCLK) controls time in association with the CPU 41 at aspeed two times as high as that of the CLK.

FIG. 10 shows a relation between the start signal (SI) and an analogimage output (SO). For a reading cycle (0.5 ms/Line) of the CIS 21, theimage output (SO) of prescribed number of bits is obtained. Further, inFIG. 10, the change in time of the image outputs (SO) in the lightingarea of the white colored light source 4 and the lighting area of thequasi-white colored light source 6 is shown. The image outputs (SO) ofthe prescribed number of bits sequentially appear synchronously with thestart signal (SI). Between lines respectively, a blanking interval isprovided to change the reading cycle (0.5 ms/Line) so that the level ofthe image output (SO) can be finely adjusted.

Namely, since the image read by the white colored light source 4 is thesame as the image read by the quasi-white colored light source 6 exceptimages in the hologram areas, the wave forms of the image signals (SO)are macroscopically similar to each other. Each CIS 21 is independent.Accordingly, when the image output (SO) obtained by the white coloredlight source 4 is different in level from the image output obtained bythe quasi-white colored light source 6, the blanking interval of one CIS21 is changed (that is, the reading cycle is changed), so that thelevels of the image outputs (SO) located outside both the hologram areascan be adjusted (corrected).

Now, in FIG. 11, the image of the hologram area will be described below.Since the note 1 is irradiated with the white colored light source 4 andthe quasi-white colored light source 6 whose irradiation angle isdifferent from that of the white colored light source 4, in other areasthan the hologram areas, a difference arises in the absolute level ofthe output. However, since the same image is read, similar output waveform distributions are obtained. On the other hand, in the hologramareas, since the note is irradiated with the light sources fromdifferent angles, different image outputs are obtained. Especially, whenthe note is irradiated with the white colored light source 4, thedifference obviously appears due to the emission of a plurality ofspectrums.

In the CIS 21, the white colored light source 4 using a fluorescent lamphaving a high output is applied to the note at an incident angle asnarrow as 30° from a remote part and the quasi-white colored lightsource 6 having the emission of the light of RGB as the same whitecolored light source of a relatively low output is applied to the noteat an incident angle as wide as 45 to 60°. In the quasi-white coloredlight source 6 of RGB, the white colored light source is obtained bycovering a plurality of visible ray areas as shown in FIG. 12. However,in the visible ray area, an LED light source having other spectrums maybe used and an LED light source emitting infrared rays or ultravioletrays may be added and used as the quasi-white colored light source 6.

Further, also as shown in FIG. 12, the light receiving part 10 of theCIS 21 characteristically has a high spectral sensitivity to a redcolored light emitting side for an optical wavelength. Accordingly, asshown in FIG. 13A, the light receiving part 10 directly receives thereflected light of the white colored light source 4 to read the hologramarea. As compared therewith, as shown in FIG. 13B, after the sensor ICis formed, an RGB filter for reading color is formed in the lightreceiving part 10 by equally dividing pixels into three and applying atransparent gelatin material to the pixels respectively and a part of aplurality of spectrums is filtered before a photoelectric conversionprocess to suitably select and out the image output (SO). Thus, a truthor falseness of the hologram area can be decided in accordance with acolor code. In FIG. 13B, for instance, a filtering function is employedfor a green colored light emission (G) in the intermediate part of thevisible ray areas to take out the image output (SO) from a G terminal ofthe sensor 10, so that the truth or falseness of the note 1 can bediscriminated by a unique optical recognition different from a naturallight.

Now, the inserting direction of the note 1 and the identification of theform of the hologram will be described below by referring to FIG. 14.The hologram data stored in the RAM 3 as the reference data is differentbetween a case in which the note 1 is conveyed in a longitudinaldirection and a case in which the note is conveyed crosswise. FIG. 14Ashows a case in which the note 1 having a belt shaped hologram area inthe direction of width of the note 1 is conveyed in the longitudinaldirection of the note 1 and detected by the photo-sensors 30,respectively and called a vertical belt type hologram. As comparedtherewith, FIG. 14B shows a case in which the same note 1 is conveyedcrosswise the note 1, detected by a part of the photo-sensors 30 for arelatively long time and called a horizontal belt type hologram.Further, in FIG. 14B, there is a hologram called a floating island typehologram that is detected by a part of the photo-sensors 30 for arelatively short time irrespective of the inserting direction of thenote 1.

Now, a method for detecting the size of the note 1 or the size of thehologram area on the basis of an output from the photo-sensor 30 will bespecifically described by using the vertical belt type hologram as anexample. FIG. 15 shows a signal comparing circuit incorporated in thelight source driving circuit 40 for inputting the output (FO) of thephoto-sensor 30 to the ASIC 12 via the light source driving circuit 40.The outputs of the photo-sensors 30 are respectively processed by theASIC 12 by specifying the levels of the photo-sensors 30 by levelcomparators of two systems incorporated in the light source drivingcircuit 40.

FIG. 16 shows the change of the outputs of the photo-sensors 30 with thelapse of the conveying time of the note 1. In FIG. 16, in the FO1 to FO4of the photo-sensors 30, after 50 ms from the detection of the edge ofthe note, the hologram area is detected. After 70 ms, the passage of thehologram area of the note 1 is detected. After 150 ms, the opposite edgeof the note 1 is detected.

Further, as for the read width of the note 1, in FIG. 16, the output(FO5) of the photo-sensor 30 does not always detect the signal of thenote 1.

As described above, when the note 1 is conveyed in the longitudinaldirection of the note 1, the length of the note 1 is determined from anelapsing time from the detection of the first edge of the note 1 to thedetection of the opposite edge of the note 1. The length of the hologramarea of the note 1 is understood from a time of the passage of thehologram area of the note 1.

Further, the approximate width of the note 1 is known from the positionsof the FO1 to F05 of the photo-sensors 30 spaced mutually and theapproximate width of the hologram area of the note 1 is additionallyknown. In detection of the width, when a high accuracy is required,intervals at which the photo-sensors 30 are disposed may be allowed tocome close to each other or another CIS on which a transmission typelight source is mounted may be added to meet the request.

Further, when the detecting area of the photo-sensor 30 is relativelywide so that a response to the edge of the note 1 is slow, asemiconductor laser sensor having a beam spot of about 50 μmø may beused to enhance an accuracy for the detecting position of the edge,shorten a response time to the detecting level and decrease a samplingtime as an interval for a detecting time. Thus, the accuracy in time fordetecting the size of the note 1 or the position of the hologram areamay be improved.

As described above, the CPU 41 sets an optimum kind (address) of thereference data stored in the RAM 3 to be collated on the basis of theinformation of outputs (designated by MO1 to MO10) of the comparators 1and 2 shown in FIG. 15.

(Collation)

Now, referring to FIG. 17, a collating method will be described below indetail. In the first embodiment, in the case of 300 dpi, the readingdensity in the direction of a read width is 1872 bits. In the case of600 dpi, the reading density is 3744 bits. Either density may meet thenote of about 160 mm or smaller. The number of read lines is determinedto be 1280 bits that meets the note of 160 mm or smaller. Here, as shownin FIG. 13B, a CNT terminal (a reading density switching terminal) ofthe sensor 10 is set to 300 dpi and a photoelectric conversion output ofa total of 1872 bits is described in which only the odd number bits ofpixels respectively operate.

Initially, the white colored light source 4 a is turned on and a fetcheddata signal is stored in the RAM 1 having a 1872×1280 area andtransferred at the same time to the reading system as a digital imagesignal (SIG) in a real time for referring to and displaying an image.Similarly, the quasi-white colored light source 6 b is turned is turnedon and a fetched data signal is stored in the RAM 2 having a 1872×1280area.

Then, the CPU 41 performs a subtraction process of the address data ofthe data of the RAM 1 and the data of the RAM 2 to compare differencesrespectively and store the data of differences of absolute values to theRAM 1. Then, the CPU 41 performs a subtraction process to specify theaddress in which a change is large, respectively reduce the data in theaddresses and stored the data in the RAM 2. Since the image read by thewhite colored light source 4 a and the quasi-white colored light source6 b is the same, the absolute values of the data of other parts than thehologram area are different, however, the data is similar. Therefore,the above-described signal process is carried out. At this time, theprocess of the peculiar bit is carried out as described above, andaccordingly, the data smaller than a prescribed value may be possiblytreated as hologram area data. This hologram area data is called ahologram distribution map to specify a kind or a candidate of the dataof the RAM 3 and collated with reference hologram data (collating data)transferred from the RAM 3.

In the difference between the data of the RAM 1 and the data of the RAM2 that are initially fetched, the data of the RAM 1 is macroscopicallycompared with the data of the RAM 2 in the data area corresponding toboth the edge parts of the note 1. The displacement of addresses iscorrected by rearranging the addresses between the data of the RAM 1obtained by the white colored light source 4 and the data of the RAM 2obtained by the quasi-white colored light source 6. Thus, theconsistency of the data is preferably maintained.

FIG. 18 shows an example of the specific difference data of the RAM 1and the RAM 2 and the hologram area is specified and determined by thedifference value. In FIG. 18, 35 digits or more is selected to determineto be the data of the belt type hologram area.

FIG. 19A shows a specific example of a floating island type hologramarea. When the kind of the hologram area is determined, CPU 41 specifiesthe kind of the data of the RAM 3 meeting a suitable hologramdistribution map to transfer the reference hologram data (collatingdata) of the RAM 3 to the collating circuit and sequentially collate thedata of the RAM 3 with the data of the RAM 2.

Now, the collation will be more described below by using the floatingisland type hologram data shown in FIGS. 19A to 19C. FIG. 19B shows dataobtained by taking out only a floating type hologram not less than 35digits. The floating type hologram data is collated with data stored inthe RAM 3 that is previously set as the reference hologram data(collating data) shown in FIG. 19C. Here

the number of addresses and the capacity of the number of data of eachaddress that are stored in the RAM 2 are set to be larger than thecapacity of the data stored in the RAM 3.

Subsequently, as shown in FIG. 20, the data of the RAM 3 is transferredto the one dimensional interactive shift register by an A/D signal (anaddress designating signal) for each address and transferred again to aninteractive shift register latch part (a latch part). In the latch part,the data is collated with the data of the RAM 2 by an R/L signal (aright and left shift signal) for each address of the data of the RAM 2.

The data of the RAM 2 is directly inputted to a cell area logiccollating gate circuit composed only of a logic circuit through a shiftregister by the A/D signal. On the other hand, in the data of the RAM 3,the data in the address is shifted (swept) rightward and leftward by theR/L signal from the CPU 41 a plurality of times. An LA signal (a latchsignal) is transmitted at each time of the shift of each data of the RAM3 and the data is collated in the cell area logic collating gate circuitfor each time. The collation is carried out in accordance with the riseand fall of the data in each address. As shown in FIG. 21, whether ornot the rise and fall of the data (1) of the RAM 3 correspond to thoseof the address of the data of the RAM 2 is checked for each address ofthe data of the RAM 2.

When the data (1) of the RAM 3 corresponds to the data of an arbitraryaddress of the RAM 2, the cell area logic collating gate circuittransmits a corresponding signal to the CPU. The CPU 41 specifies theaddress of the RAM 2 on the basis of the number of transmissions of theR/L signal to the address of the RAM 2.

Then, the data (2) of the RAM 3 as the data of a next address of the RAM3 is transferred and collated with the data of a next address of thespecified address of the RAM 2. When the data correspond to each other,the cell area logic collating gate circuit transmits a correspondingsignal to the CPU 41. At this time, the CPU 41 may output acorrespondence deciding signal to the reading system. However, the CPUmay transfer the data (3) of the RAM 3 as the data of the address afternext of the RAM 3, collate it with the data of the address after next ofthe specified address of the RAM 2 to recognize the correspondencethereof, and then, transmit a deciding signal to the reading system.

In the first embodiment, the digital data of the RAM 1 to RAM 3 is setto 5 digits as a collating unit for convenience′ sake, however, 10digits may be used. Further, when the difference is compared in thewhite colored light source 4 a or the quasi-white colored light source 6a, an address for fetching several pixels of image data stored in theRAM 1 or the RAM 2 may possibly change due to a conveying shift in thedirection of width of the note 1 as short as 0.1 mm or an unevenness inconveying speed of the note 1. In such a case, since, as the data storedin the RAM 1 and the RAM 2, not an image signal, but only a truth andfalse deciding signal is required, average data of mutually adjacentbits and next lines is stored in the RAM 1 and the RAM 2 like theprocess of the above-described peculiar bit. Thus, an identifyingresolution may be set to ¼ to simplify a collating decision.

Further, FIG. 22 shows an example when the output of the sensor 10 isresolved for each spectrum. In the drawing, the reflected light of thehologram area mainly includes red colored (R) light. Further, in thesensor 10 produced in a semiconductor producing process, as shown in aspectral sensitivity curve of the sensor in FIG. 12, as the opticalwavelength becomes higher in the visible ray area, a light receivingsensitivity becomes higher. Accordingly, the output value of the sensor10 is affected with the red colored light. Thus, when a problem arisesin a truth and false discriminating accuracy, the image output (SO) ispreferably received through an R-Filter shown in FIG. 13B. In that case,as the reference data stored in the RAM 3, data actually measured underthe same conditions is stored.

Further, in the first embodiment, since a high definition hologram areaby wiring the data by laser is mainly described, the sensor 10 having aresolution of 300 dpi is used to have data for each pixel and a digitalconverting level of 256 digits (8 bits). However, in a decision of thetruth or falseness of a hologram area by using a simple prism or areflecting member and a printing pattern, since an image pattern is notfine, the digital converting level of 64 digits (6 bits) may be used. Ina hologram of a printing pattern optically changing and different onlydepending on an angle for viewing, a sensor IC having a resolution ofabout 8 dots/mm may be used to decide a truth or falseness.

As described above, the irradiated parts disposed along the conveyingdirection of the note 1 are irradiated with lights at different anglesto detect the difference of the spectrums of the reflected lightsgenerated in the hologram area so that the image reading device capableof highly accurately discriminating a truth or falseness can beobtained.

Second Embodiment

A second embodiment of the present invention will be described byreferring to FIG. 23. FIG. 23 is a sectional structural view of an imagereading device according to the second embodiment. In FIG. 23, 21designates a CIS in which white colored light sources 4 and quasi-whitecolored light source 6 are disposed at both the sides of an irradiatedpart 3. A CIS 21 a and a CIS 21 b are arrange on one surface side of anote 1 and a CIS 21 c and a CIS 21 d are arranged on the other side ofthe note 1. In the drawing, the same reference numerals show the same orequivalent parts as those of FIG. 2.

Now, a structure will be described below. In FIG. 23, two white coloredsources 4 are mounted on one CIS 21 and the note 1 in the irradiatedpart 3 is simultaneously irradiated with the white colored light sources4 at the same angle from both sides. Similarly, two quasi-white coloredlight sources 6 are mounted on the CIS 21 and the note 1 in theirradiated part 3 is irradiated simultaneously with the quasi-whitecolored light sources 6 at the same angle different from that of thewhite colored light sources 4 from both sides.

As described above, since the note 1 is irradiated with the lights atthe same time from both the sides, even when uneven surfaces aregenerated in the note 1 in the irradiated part 3 due to the change of aswell during conveying the note 1, a shadow generated in one of theuneven surfaces of the note 1 does not appear as compared with a casethat the note is irradiated with the light from one side, because thenote 1 is irradiated with the lights at the same angle from both thesides of one surface of the note 1. An inconvenience due to unevennessin conveying the note 1 can be cancelled, whether the note 1 is true orfalse can be discriminated or an image can be read in a stable way. Theoperation, the function and the discriminating method are the same asthose described in the first embodiment except that the lights areapplied to the note from both the sides.

Third Embodiment

A third embodiment of the present invention will be described byreferring to FIG. 24. FIG. 24 is a sectional structural view of an imagereading device according to the third embodiment. In FIG. 24, 60designates a quasi-white colored light source (a second light source)composed of an LED light source. 70 designates a black colored block (afirst light shield member) made of a plastic material to hold thequasi-white colored light source 60. 80 designates a second light shieldmember made of a plastic material and is held by the black coloredblock. 100 designates a sensor. 100 a designates a first sensor and 100b designates a second sensor. 110 designates a substrate (refer it alsoto as a first substrate) for holding a white colored light source 4. 120designates a sensor substrate (refer it also to as a second substrate)on which the sensor 100 is mounted. 160 designates an input and outputconnector (an external connector) for transmitting and receiving asignal. 170 designates a transmitting member having two irradiated parts3. 210 designates a CIS. 210 a is a CIS arranged on one surface side ofa note 1 and 210 c is a CIS arranged on the other surface side of thenote 1. In the drawing, the same reference numbers designate the same orequivalent parts of FIG. 1.

Now, a structure will be described below. In FIG. 24, two lens arrays 9a and 9 b are mounted on one CIS 210 and two irradiated parts 3 arerespectively provided correspondingly to the lens arrays 9. When thenote 1 is conveyed, the note 1 located in the irradiated part 3 a isinitially irradiated with the white colored light source 4 and thereflected lights thereof are focused by the lens array 9 a and receivedby the sensor 100 a. Further, when the note 1 is conveyed to theirradiated part 3 b, the note 1 located in the irradiated part 3 b isirradiated with the quasi-white colored light source 60 and thereflected lights thereof are focused by the lens array 9 b and receivedby the sensor 100 b. The CIS 210 c also independently operates in thesame manner as that of the CIS 210 a.

FIG. 25 is a plan view of the transmitting member 170 mounted on the CIS210. 170 w designates two opening parts provided in the transmittingmember 170. The irradiated parts 3 a and 3 b are located along theopening parts 170 w.

As described above, the white colored light source 4 and the quasi-whitecolored light source 60 are mounted on one CIS 210 and the irradiatedparts 3 provided at different positions from each other along theconveying direction are irradiated with the light at differentirradiation angles, so that whether a hologram is true or false can bediscriminated by one CIS 210. Further, as compared with the first andsecond embodiments, since an external casing is integrally formed, thenumber of control lines for transmitting and receiving signals or signalprocessing ICs such as comparison and collating circuits is anticipatedto be reduced so that a compact image reading device can be realized.

The entire disclosure of Japanese Patent Application No. 2006-070519filed on Mar. 15, 2005 including specification, claims, drawings andabstract is incorporated herein be reference in its entirety.

What is claimed is:
 1. An image reading device comprising: first andsecond image reading portions which are arranged to be verticallyinverted with respect to each other and to face each other with anirradiated member, which is configured to be conveyed by a conveyingunit in a conveying direction along a conveying path, providedtherebetween, each of the first and second image reading portionsincluding: a first light source for applying light to an irradiated partin a hologram area of the irradiated member; a second light sourceseparated from the first light source along the conveying direction, toapply light to an irradiated part in the hologram area when the hologramarea is conveyed by a prescribed distance from a position at which thehologram area is irradiated by the first light source, and provided soas to apply light to the irradiated part when the hologram area isconveyed by the prescribed distance at an irradiation angle differentfrom an irradiation angle at which the irradiated part is irradiatedwith the light of the first light source, a magnitude of the irradiationangle of the second light source being different from a magnitude of theirradiation angle of the first light source; first and second rod lensarrays for respectively converging the lights of the first and secondlight sources reflected by the irradiated part in the hologram area, arespective optical axis of the first and second rod lens arrays beingdisposed orthogonal to the surface of the irradiated member; first andsecond sensors for receiving the lights respectively converged by thefirst and second rod lens arrays to photoelectrically convert thelights; and a checking unit for comparing output signals of the firstand second sensors with each other to check whether a hologram area ofthe irradiated member is true or false, wherein the first light sourceof the first image reading portion applies light to a first position ofthe conveyance path, the second light source of the first image readingportion applies light to a second position of the conveyance path, thefirst light source of the second image reading portion applies light toa third position of the conveyance path, and the second light source ofthe second image reading portion applies light to a fourth position ofthe conveyance path, wherein the first position and the third positionare spaced from each other in the conveying direction, and wherein thesecond position and the fourth position are spaced from each other inthe conveying direction.
 2. The image reading device according to claim1, wherein the first light sources of the first and second image readingportions simultaneously apply light to the irradiated member, andwherein the second light sources of the first and second image readingportions simultaneously apply light to the irradiated member.